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A241702 Number of connected graphs on n nodes with chromatic number 7. 2
0, 0, 0, 0, 0, 0, 1, 6, 110, 4125, 389583 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

COMMENTS

A diagonal of triangle in A126736.

LINKS

Table of n, a(n) for n=1..11.

Travis Hoppe and Anna Petrone, Encyclopedia of Finite Graphs

T. Hoppe and A. Petrone, Integer sequence discovery from small graphs, arXiv preprint arXiv:1408.3644 [math.CO], 2014.

F. Hüffner, tinygraph, software for generating integer sequences based on graph properties.

Eric Weisstein's World of Mathematics, Chromatic Number

CROSSREFS

Sequence in context: A156554 A197325 A197978 * A302866 A243511 A199222

Adjacent sequences:  A241699 A241700 A241701 * A241703 A241704 A241705

KEYWORD

nonn,hard,more

AUTHOR

Travis Hoppe and Anna Petrone, Apr 27 2014

EXTENSIONS

a(11) added using tinygraph by Falk Hüffner, Apr 04 2017

STATUS

approved

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Last modified July 30 16:44 EDT 2021. Contains 346359 sequences. (Running on oeis4.)